![]() If you’re still close to the focal plane, we’re talking distances that are about the Rayleigh range here, you should still use the same calculator as suggested above. If the beam diameter is not exactly at the focal plane, you have two options. They will also provide some complementary information regarding their measurement definition on top of being proper calculation tools.įor calculating your spot size at the focal plane, use the spot size and beam waist calculator. It is important to make a distinction between the two cases because the approach to measurement is different.Īctually, we made two free calculators that are easy to use and fit these different scenarios. Without the context of what someone wishes to achieve with a measurement, it is easy to get lost in translation.įor some people, the expression spot size of a laser beam means its smallest diameter at the focal plane when focused by a lens, whereas for other people they mean the laser beam’s diameter when it exits the laser, or at any other place where they need to measure it. ![]() Do you want to measure the focal spot size or the beam diameter? Let’s look at each one and why I ask them. Do you have the appropriate instruments?.Which beam diameter definition do you want to use?.Do you want to measure the focal spot or the beam diameter?.When someone asks me how to measure the spot size of their laser beam, I often answer with a few questions, because this type of measurement is not as simple as it can appear at first glance, especially if you want to do it with precision and rigor.
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